One thing which I suppose isn't surprising, but still was amazing to see at scale, is I put a drop in Colorado that ended up in the Gulf of Mexico. As the camera followed the path, it's nothing but farms, with the odd city sprinkled in. I got bored and left in Nebraska, but I imagine it's like that the whole way. It's obvious it takes a lot of land to feed everyone, but to see it like that really drove it home.
Depending on where you placed that drop in Colorado it also could've ended up in the Pacific. The continental divide is in Colorado and all water west of the divide will eventually drain into the Pacific and all water east will drain to the Atlantic. https://en.wikipedia.org/wiki/Continental_Divide_of_the_Amer...
From Wikipedia: “ The hydrographic Great Basin is a 209,162-square-mile (541,730 km2) area that drains internally. All precipitation in the region evaporates, sinks underground or flows into lakes (mostly saline). As observed by Fremont, creeks, streams, or rivers find no outlet to either the Gulf of Mexico or the Pacific Ocean. ”